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Fantastic article wishcraft.
I have installed sitemap 1.30b on
my site and tested it to see where it falls short based on all the points you have made. The XML file it generates seems to work properly but only includes the required tags. Optional tags such as 'lastmod', 'changefreq' and 'priority' are only created for the site's home directory.
The only real shortcoming is the lack of help information provided for users that may not fully understand software design and implementation. For example, there is only a short blurb in the download section about placing the xml_google.php file in your root directory and then register it with google. But I could not find any of this information provided within the software package.
I have been making some of my own hacks to the module mainly in an attempt to make it more user-friendly.